A kind of production process of recovering potassium chloride from saturated potassium mirabilite mother liquor

A production process, the technology of potassium mirabilite, applied in the direction of alkali metal chloride, etc., can solve the problems of difficult separation and complex recovery process of potassium salt, and achieve the effect of simple composition, simple process and simplified precipitation form

Active Publication Date: 2017-03-15
CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art, break through the technical shortcomings of the existing potassium salt recovery process complex and difficult separation, and provide a simple process, low energy consumption and cost, and less equipment investment. A production process for recovering potassium chloride from saturated potassium mirabilite mother liquor, which avoids eutectoid of potassium-containing sulfate minerals, improves crystal phase composition, and has a high recovery rate of potassium chloride

Method used

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  • A kind of production process of recovering potassium chloride from saturated potassium mirabilite mother liquor
  • A kind of production process of recovering potassium chloride from saturated potassium mirabilite mother liquor
  • A kind of production process of recovering potassium chloride from saturated potassium mirabilite mother liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Add brine: mix 1000g of saturated potassium Glauber's salt mother liquor (See Table 1 for the chemical composition) and 689g salt lake old brine (See Table 1 for the chemical composition) Mix the brine at 20°C and mix evenly to obtain 1689g of the brine mother liquor;

[0035] (2) Sun-dried potash salt: transfer 1689g of the bittern mother liquor obtained in step (1) into the potash salt field, and at 23°C, naturally evaporate 570g (equivalent to 33.75wt% of the bittern mother liquor) of water to precipitate potash Solid-liquid separation after salt, to obtain 347g potassium halite and 772g mother liquor A;

[0036] (3) Sun-dried carnallite: transfer 772g of mother liquor A obtained in step (2) into a carnallite salt field, and naturally evaporate 98g (equivalent to 12.69wt% of mother liquor A) of water at 22°C to precipitate carnallite After solid-liquid separation, 216g carnallite and 458g mother liquor B were obtained;

[0037] (4) Extraction of potassium chlo...

Embodiment 2

[0042] (1) Add brine: mix 1000g of saturated potassium Glauber's salt mother liquor (See Table 2 for the chemical composition) and 1177g salt lake old brine (See Table 2 for the chemical composition) Mix the brine at 25°C and mix evenly to obtain 2177g of the brine mother liquor;

[0043] (2) Potassium salt production by drying: transfer 2177g of the bittern mother liquor obtained in step (1) into the potash salt field, and at 23°C, naturally evaporate 496g (equivalent to 22.78wt% of the bittern mother liquor) of water to precipitate potassium stone Solid-liquid separation after salting, to obtain 313g potassium halite and 1368g mother liquor A;

[0044] (3) Sun-dried carnallite: transfer 1368g of mother liquor A obtained in step (2) into a carnallite salt field, and naturally evaporate 232g (equivalent to 16.96wt% of mother liquor A) of water at 26°C to precipitate carnallite After solid-liquid separation, 400g carnallite and 736g mother liquor B were obtained;

[0045] ...

Embodiment 3

[0050] (1) Add brine: mix 1000g of saturated potassium Glauber's salt mother liquor (See Table 3 for the chemical composition) and 917g salt lake old brine (See Table 3 for the chemical composition) Mix the brine at 30°C and mix evenly to obtain 2917g of the brine mother liquor;

[0051] (2) Potassium salt production by drying: transfer 1917g of the bittern mother liquor obtained in step (1) into the potash salt field, and naturally evaporate 562g (equivalent to 29.32wt% of the bittern mother liquor) of water at 28°C to precipitate potassium stone Solid-liquid separation after salt, to obtain 340g potassium halite and 1015g mother liquor A;

[0052] (3) Sun-dried carnallite: transfer 1015g of mother liquor A obtained in step (2) into a carnallite salt field, and naturally evaporate 242g (equivalent to 23.84wt% of mother liquor A) of water at 27°C to precipitate carnallite After solid-liquid separation, 251g carnallite and 522g mother liquor B were obtained;

[0053] (4) E...

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Abstract

The invention provides a production technology for recycling potassium chloride from saturated glaserite mother liquor. The production technology comprises the following steps of 1, conducting brine mixing, wherein the saturated glaserite mother liquor and old brine in a salt lake are mixed according to the mass ratio of 1:0.6-1.5, and mother liquor mixed with the brine is obtained; 2, sun-curing sylvine, wherein after 20 wt%-35 wt% of water in the mother liquor mixed with the brine is naturally evaporated, solid-liquor separation is conduced, and then the sylvine and mother liquor A are obtained; 3, sun-curing carnallite, wherein after 10 wt%-30 wt% of water in the mother liquor A is naturally evaporated, solid-liquor separation is conduced, and carnallite and mother liquor B are obtained; 4, extracting potassium chloride, wherein floatation is conducted on the sylvine and the carnallite, and then the potassium chloride product is obtained. By the adoption of the production technology, the recovery rate of K+ in a technological salt field reaches up to 96.61%, the total yield of the K+ of a system reaches up to 91.95%, the purity of the potassium chloride product reaches up to 98.06%, and the potassium chloride product meets the agricultural potassium chloride superior product standard. The production technology is simple, low in energy consumption and cost, avoids co-separation of potassium-containing sulfate minerals, part of old brine in the salt field can be digested, and the environmental-protection problem is effectively relieved.

Description

technical field [0001] The invention relates to a potassium salt recovery process, in particular to a production process for recovering potassium chloride from saturated potassium mirabilite mother liquor. Background technique [0002] Potassium chloride is the main raw material in the conversion of potassium sulfate production, widely exists in solid potassium salt ore, or can be extracted and separated from potassium-containing sea salt lakes. In the production of potassium sulfate by the conversion of Glauber's salt, a large amount of first-stage conversion mother liquor, that is, saturated potassium Glauber's salt mother liquor, whose potassium content is about 40% of the potassium content in the system, will be produced. If it is not properly recycled, it will greatly affect the system. Potassium yield, reducing the production efficiency of enterprises. It is difficult for the mother liquor to obtain relatively pure single potassium salt through a pure evaporation and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/06
Inventor 高文远李昱昀汤建良郑贤福
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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